精选优质文档-倾情为你奉上1. Single Choice1) Which one of the following is NOT TRUE for database language? (_c_)A. Relational Algebra is a procedural database language.B. SQL is a declarative database language.C. SQL is both a declarative database language and a pure database language.D. SQL is both data definition language and data manipulation language. 2) Which one of the following is NOT TRUE for relational model? (_) A. In a relation, a foreign key can be a subset of
